Aha.
http://en.wikipedia.org/wiki/Power_supply_unit_%28 computer%29Pin 13 supplies +3.3 V power and also has a second thinner wire for remote sensing.
Aha.
http://en.wikipedia.org/wiki/Power_supply_unit_%28 computer%29Pin 13 supplies +3.3 V power and also has a second thinner wire for remote sensing.